A class A subnet uses the first octet of an IP address to designate the network ID, and the remaining three octets for the designation of the Host ID.
Host ID | | | | | | ip address xxx.xxx.xxx.xxx | | Network ID
The first bit of the first octet is always set to zero to indicate a Class A address, therefore this leaves 7 bits to represent the Network ID. This means that there is a maximum of 127 Class A addresses and because 127 is reserved for the loopback function of the network card this gives a maximum of 126 Class A addresses.
As the remaining 24 bits are available for the Host ID this provides for 16, 777,214 or (224) ?2 hosts per network.
Gordano software assumes that you are using a Class C subnet mask for local mail authentication. If you are using a Class A subnet, you will need to alter the local IP settings appropriately.
Keywords:IP Address subnet class